iOS ANDROID

Client Server

eJabberd

MultiChat

STUN server

DTLS

Encrypted Audio Channel (SRTP)

Firewall

Fire

wal

l

Caller 1 Caller 2

eJabberd 2

serverApplication

Sender

Message

through

XMPP protocol

TLS 1.2

communication

channel

Message throughXMPP protocol

TLS 1.2 communication

RecipientRecipient

Message throughXMPP protocol

channel

TLS 1.2 communication

channel

Viber Skype MultiChat

MultiChat